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Proceedings Paper

On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system
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Paper Abstract

The Gemini Planet Imager instrument's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. It features several new technologies, including computationally efficient wavefront reconstruction with the Fourier transform, modal gain optimization every 8 seconds, and the spatially filtered wavefront sensor. It also uses a Linear-Quadratic-Gaussian (LQG) controller (aka Kalman filter) for both pointing and focus. We present on-sky performance results from verification and commissioning runs from December 2013 through May 2014. The efficient reconstruction and modal gain optimization are working as designed. The LQG controllers effectively notch out vibrations. The spatial filter can remove aliases, but we typically use it oversized by about 60% due to stability problems.

Paper Details

Date Published: 21 July 2014
PDF: 15 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91480K (21 July 2014); doi: 10.1117/12.2057092
Show Author Affiliations
Lisa A. Poyneer, Lawrence Livermore National Lab. (United States)
Robert J. De Rosa, Arizona State Univ. (United States)
Univ. of Exeter (United Kingdom)
Bruce Macintosh, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Lawrence Livermore National Lab. (United States)
David W. Palmer, Lawrence Livermore National Lab. (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Naru Sadakuni, Gemini Observatory (Chile)
Dmitry Savransky, Cornell Univ. (United States)
Brian Bauman, Lawrence Livermore National Lab. (United States)
Andrew Cardwell, Gemini Observatory (Chile)
Jeffrey K. Chilcote, Univ. of California, Los Angeles (United States)
Daren Dillon, Univ. of California, Santa Cruz (United States)
Donald Gavel, Univ. of California, Santa Cruz (United States)
Stephen J. Goodsell, Gemini Observatory (Chile)
Markus Hartung, Gemini Observatory (Chile)
Pascale Hibon, Gemini Observatory (Chile)
Fredrik T. Rantakyrö, Gemini Observatory (Chile)
Sandrine Thomas, NASA Ames Research Ctr. (United States)
Univ. of California, Santa Cruz (United States)
Jean-Pierre Veran, NRC - Herzberg Institute of Astrophysics (Canada)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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